<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>计算器</title>
    <link rel="stylesheet" href="./css/index.css" />
  </head>
  <body>
    <div class="calculater">
      <input type="number" id="val1" />
      <select id="select">
        <option value="+">+</option>
        <option value="-">-</option>
        <option value="*">*</option>
        <option value="/">/</option>
      </select>
      <input type="number" id="val2" />
      <input type="button" value="=" id="btn" />
      <input type="number" id="result" />
    </div>
    <script src="./js/jquery-1.12.4.min.js"></script>
    <script src="./js/index.js"></script>
  </body>
</html>
